/* SPDX-License-Identifier: GPL-2.0 */
#ifndef SEMINIX_TIME_TIMERQUEUE_H
#define SEMINIX_TIME_TIMERQUEUE_H

#include <utils/rbtree.h>
#include <seminix/ktime.h>

struct timerqueue_node {
    struct rb_node node;
    ktime_t expires;
};

struct timerqueue_head {
    struct rb_root head;
    struct timerqueue_node *next;
};

extern bool timerqueue_add(struct timerqueue_head *head,
               struct timerqueue_node *node);
extern bool timerqueue_del(struct timerqueue_head *head,
               struct timerqueue_node *node);
extern struct timerqueue_node *timerqueue_iterate_next(
                        struct timerqueue_node *node);

/**
 * timerqueue_getnext - Returns the timer with the earliest expiration time
 *
 * @head: head of timerqueue
 *
 * Returns a pointer to the timer node that has the
 * earliest expiration time.
 */
static inline
struct timerqueue_node *timerqueue_getnext(struct timerqueue_head *head)
{
    return head->next;
}

static inline void timerqueue_init(struct timerqueue_node *node)
{
    RB_CLEAR_NODE(&node->node);
}

static inline void timerqueue_init_head(struct timerqueue_head *head)
{
    head->head = RB_ROOT;
    head->next = NULL;
}

#endif /* !SEMINIX_TIME_TIMERQUEUE_H */
